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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab3fa8fbefcc0fa9d5c536abeae975515c350e6e7cc9e99ace12e5dc3cd03c20' 
  AND token = 'ZF5qVTTJjliDSbB2seFjF2F41jpnFzVPPUiBD9K7Xvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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