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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5892a4f236da5051aa371a04c31645e9525cc9ea721226dff2980cc177cc1aa2' 
  AND token = '+8kiJ+4eNiJ9VWVi5yfTWwQTGnro/v0VFGQT28f8sK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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