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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71b13c1639eb6940bec73f6d5011a4081b5ae8da3c8ac1cd5461b882ba9c0fdb' 
  AND token = 'Qr9v8y9qk2GhGyforLR7+53OUwmaI+e8tU1ayRcu1CI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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