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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf2cac70a17a3358b308ab2797c39495d3adb58b5f849900d38642e6fcdccbc4' 
  AND token = '0sDvlEIfAPZFv4IDjg+/8pv/w+/YixjizAcNvPv00F0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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