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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06b3e82a8e81aa22b8319d01c916378e886359130663f63f873e61ee24f0483f' 
  AND token = 'ondRmZ7vLXvGasUI8h64NpjrDAKeXhu+j1pBPXQCOg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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