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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b0213b90185b0403af3bc1b9db4ee0512e5806585c7b12e5aae77cf4117710c' 
  AND token = '1n0ek6BfvI5DuQJqlhY7dz6jsyTrDXEj6itFQNGo7e4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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