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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82c513496b19bcd11fb105ee420ca18489a2db28f77884947d567f0034be0d97' 
  AND token = 'UEi8b8QKJOEiOyn456LvJutt3Osv/bF+kNKWav1vLVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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