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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76a2e65fbd11e7ebb17dd1af6a0c0e93f7c8a176a3031892b4db7f1f86e6571e' 
  AND token = '6tzvaIgzcFGPsyoS96L8xPlM7ei+rmpVXC4R62AvgWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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