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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3ebc9e79c5a66f139c18c7e9b5de13c83419ae8851fad71a1f2cfd9d55cae35' 
  AND token = 'V8Bk3hwKoQnuBiauETxuq3gZtIqvK6luKaQnjHxKsr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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