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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7df3ee02540503e5dfdfefdceab57787e5e9865434ea81a60d0a3605b19a37f4' 
  AND token = 'ORUr0J6lL2UhJQi9/bUsoK0p3NWJSNP6BsK0OyVAh4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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