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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '383de9eadd0d222e95c1e68f382e170bddcb24f8e18a5d2bc82d3dda0aee0f5d' 
  AND token = 'rLlalE8tPJqxyPNk9xacHKUPASknka0PPyazn1Mpjp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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