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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3abacb803f68c1b43f507bf21f9a0005fd782b42439bd98d8c82f1dab12be67' 
  AND token = 'Nl9sBJsKHSNAsXUile8lwthcHgtGjHgCphj4H0FRSX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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