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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e4e4ef7069ae766b2dfc6ca4766f9067bcf0cdd3e751ed64f8575d3868a13a8' 
  AND token = 'nJVnRLasB5cYFqC/gyODwqIDgtguXo5zfZr6Gfg9dZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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