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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceb0a2deef97fef8f79577b4934a94598a0f3e4cb328ff00be158a264a7157bb' 
  AND token = 'fSCsy1Ki1XkvkleDSSJV3rXGfovBTVLU743L+spZdZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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