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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e39c0544ef7cc5b2c3dcfe5d5cb146af59fc54fd47c7e0b71d9e5103bb8fcae' 
  AND token = 'cGRbdwPKpy8w0afE71oMCagNvX/3wpPWCHHDQlbwbfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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