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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '012f7ea350576127a7b536255fec34494307f75db49d4d5ead1bc6b6824db977' 
  AND token = 'ttHeJVqQZZ1kZDmbxm0Tii6J2i/l0ajVwIRFQSDyRpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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