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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b39a1b2e69a571c5022fb34a0c74ecf678348e0f7389abecbc14d3c593906bbc' 
  AND token = 'y64SYXevljOHzcSVdLHrKSgl9xk8oZQ8KYyMqXfdnlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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