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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2c0ac36766858300599fec24f768471fa694e582fbc4ea979d0694c4b3681a8' 
  AND token = 'u7KzFDfB3xh61oGx9frq7UB+w55i7P/dVHkc/uwzi38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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