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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48902f649c70fe916977031b555d0879e452eb4a7f370b2e0f0f7b95072cb25b' 
  AND token = '/deo+6+fBs964BtOxAbljGcAL2jNklGN1OhVxCvWgNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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