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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cbdfb37f5bbec2319b735127fc4ac5b10769be99b051192fe49cae34d090cce' 
  AND token = 'Um3PiBap1sBaCXz9BhszN47+TZVe7QC2FgYfiiPr5dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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