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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '902b68d654e1c4d69de31f2eeb138e2f2f0a6e1ab836e53883494dd91011063b' 
  AND token = 'k+SjbveoJBGgFAHR5Ja8pTR4isIXppk0Qb9v32g37jE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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