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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6ab390d9d40115f9002a3247dacc59a5968bdae6006287f39fba32ad9667c2e' 
  AND token = 'RT2wr6YsKDyg3SMQ6xlRzJ1bOax9Ki092xzkx8Y461k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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