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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '689258270c52d0b061cfd5da3786d75bb5a12c9875e7791c3f50dd29f9e2c18c' 
  AND token = 'MYOn4u+x0WZBO1GsJidcvEytNGtgTT6NruYTIs7KkxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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