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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8953dc85d41b82588d14f04fe1f543f2ad2f670802d0b97694e5005a64e9a0dd' 
  AND token = 'XdH2wtZtbcuXbUlp796dICqIPZDEj17cJGvhDILyXCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}