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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dca6c73e55932b139317a3c521a236d017df0c4d87b069a72e7a93c1b48947c1' 
  AND token = '7uWUYMRsmbjxWESlmUnDyslzYePHDreJHfSyuJi1xAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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