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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '556fce6e65f73d3fe387b2c83dd98d510e70559c7870b87039f7a5c64969c391' 
  AND token = '4VfcUNsufpuPDKxqxbZBMdI0BlPj4IHVMCHH6/xoLgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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