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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c9dd873e338bc1013fc9afdca670a006e7b3a67f8801dc2ae35ffb2a113b5bb' 
  AND token = '5/KMMTH7mj4BObgxfYbYDnnb0BL8Z/8s/LwI8PekuNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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