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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3f8379dd5159617f8f44d5bd96ddac1acb023c6cc6188340325b87bd5f2e24e' 
  AND token = '7NiKGseuw94lpf/kLH7aaFTEIQ/azSdU5+P1PTIO9/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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