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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8f0df676658a0692869fa66ddf80990dc8804eb0ce38b7b5e6bfc0eb29df572' 
  AND token = '42uQ4QowNtNNBP3e5NqS3L8jkYRRpowTJQYaumCYUUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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