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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e3c9b3ff20e2e6bf57889466037e927ce8147fd4e4b36762fc303e10ebfec2a' 
  AND token = '6mV9AKtErNCzhb3cVrElFKMuc4geneaRB2FPkyEqgvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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