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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c24818c9c0c36377e46259b547ed8557d5ea2d512ec2abccbd3b0833bae81e55' 
  AND token = 'haRXU0ihSz5g4WRgLx4DS4uI0f9n1DXf9WrwOuXzpyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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