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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eed4fb01e2b388a8498ce5c514326fd6ee02e0b1e3c0671e8c38c389aa696a0' 
  AND token = '9s16wItXqB9kbjzuNM9Mp/yRdamov3w6qzLFEq+4p/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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