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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f1a0d8ee4a8d2b1cc3b0d64f4889e9fe06a9bfcd0547d42f9e8a000a1dfae6b' 
  AND token = 'XTJlos96Ky29RTcVayQGO+f2JjcepmqkTRxSW2tV/Ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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