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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96e5b5631cdf0a8bb58b5faaf9759b82e6a30ee207b0e0be28fb200e52e074ac' 
  AND token = 'lREVDnwJlOp9uzxadPSUtY0EQt3Q8J5JRpFJU1zMpAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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