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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26d62db5882772eea303153807566bca191270daef1b6559c85942ec2dac21fe' 
  AND token = 'yN7+bW+SbB5tStSZDXT/uvhocAsBCek4rvHiBVjmp5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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