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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8108970e0b05db8aadc360b8f0a5cba492e8be0a34693a931b4c049add1fed07' 
  AND token = 'xCWWiERRGQ2cGp0qeWLRKyVLRWtkHBTA+VZdEv/LOms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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