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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a41504ed70eec7ba0db2f9365aee1160f9daad403bdfa4298ff965a4c65c1d44' 
  AND token = 'Pk+GdjIbcfKBddAaX981PEFmMM9lhU//8mWeFrmeZhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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