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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fbf325bb4a7baab71c1a053daf9e6576674ac0111a83d9a8d473c0cd093ae19' 
  AND token = 'XhomF0DBBCPrjBkIyw7Cn9ZL4VEi2v97B3o5y2uFGNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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