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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62db84bb0dda08b5952f1067f1b6cfb00006b5a89202d82369348d1e8ccb2828' 
  AND token = 'scGTgwSOUOPOQDkBsK4rxb2BNAJOvlKHzBp2sfidD1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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