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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79f9a6e6f0880b865343a79c48ba266ac781fecaa40df84e5fe5101d8688c2fc' 
  AND token = 'R60mGOb0pbNG6LikDCbJ2Z+z+a32U4ouxBEVbVSZHoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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