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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a54ee2bd8743aea0e71d2f4c1b981269d903c4558ae59fd70806b2ba10aa2a6' 
  AND token = 'Diy/W896jbBGxRSaSckfb/tugwO4CvzU4SI5gpALUAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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