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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b3d8bde1cea5cebfb882ca3f93c460e4c61f000a8ee2b50d8e257c18cc7dbb9' 
  AND token = 'O20ViukhC4Tj4TP9FARSNcaqDUhFpRifB/M/gXcBiKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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