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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c22aa9ebdc0d98fe63a9175f72c3d987b201e31a884802df0c590fe674d3feb2' 
  AND token = 'yhIl3SRkxtkR21OmaQ29qEIfkl9e14LM+2Lit1eZRks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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