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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02c311f5d198371051d21e0d82a8dcb183de63a276d4779d4612b74cd805f5d1' 
  AND token = 'mlmTr0iMqU88CZaZOOUg7iwdBzdYeTU5gPWLLUUFltk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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