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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e32cd0b9b974193b4d81f546c25a2971ae11e7270cdfa160011fa993b2e2a2da' 
  AND token = '+2rHbCkqGFherjjgmIPNpf63BAgEbB/gwhQX0FafqI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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