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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c919be8ff1938cc16f0b834679f2c7d09f669dfc55916a893222cadceca562a8' 
  AND token = 'U1o9nRhDJThZPwpi6mccLhy85kE16US+rWXBfJI0RMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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