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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfdf8033e64ed5c2116dfecf30c798b3e4f8fd03e1144a18585b630601a15bfa' 
  AND token = 'bwFMoAB32BUK6Idb3VX+CET5TENULfNKftWGTTrMajg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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