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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b06368215bddf219b4d3538f4a17174662805c736bf466d0becde68712c2604a' 
  AND token = '+7csPYeXhA97z4S9fCjnmYPQd6PQXigPj2hyN6i9WfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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