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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63934f1e4ab32a3b874c99126e525fc9097ddf6e1f093013b576abc039035778' 
  AND token = '76jqb/sa24loQ7Ogk47G4zrn/XekZUjZn5T4mELJsPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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