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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2594bab594941ec4bb4f8efb64c67f9335d59fd9bf742e442430bfe45bc86918' 
  AND token = 'Of0lbgs5eqjpr+voSH2oKfn9jI0vEa3KjSC+z5PFRoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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