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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cef42eead09206bd210c2895107a0221a885e382ab4f293a2a5ea8240005002' 
  AND token = 'PHjPdLbEj1TuMCnEqkoUmtMXxH0ZCiI1pse/6jkYJ38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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