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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e94e8c065dca78d0c9d806debef3388ec824280597cd95fd1c98f7a345d87d6f' 
  AND token = '2zKfKV/X2E30obfVxw9Gqk5BzHERiSbiIrnWnMy0mQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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