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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c83004bb909da288d301e884374e73778c179b5e27f4cfe11e6a997840b2e04' 
  AND token = 'MgoRUE5VU02pJ0BLQsuGALdWTcykbTJn+2frWf7VX7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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