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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a9ef19862e7b68a6848abf039364ed75112f39199d9aff676ecf140b0332615' 
  AND token = '1nGE0OWJ2R5PsLckPxoH1IaLwiWMZ/aFycmL/v+x6Kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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