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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65f0a3fceb7906ad689d087f5684c4e6f9abcd156a99c676bfbf7783149ebcf4' 
  AND token = 'L4ag+hi3ZIRjv1BIC/Nhb/J3X39bytL5s1xnSlQ8Tlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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