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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd95a0c1064ded9667c661e95395a8eb18207dff23cb2dae3d23195321bdb6be6' 
  AND token = 'ZzoQG+zgh+2pLFK9HIU9x0oO8o0PDQylQ9je0IlUErQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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