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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '317607bebf90a3899e3a112b737e13dffa44a9afdaca5d3870023efcf2634f79' 
  AND token = 'Ti69Lyvaq1GESLO7Q7kPgCwzVDSUViL/KOVrnfCB0PY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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