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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59f13914b6f7ab2f6a1e8174dbf8c696413eba0772e5df91b3bf661b750e80b7' 
  AND token = 'dJeSlYVifSsX1DiYO7D5jQAcgOcxQZA7nz+qP97DvLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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