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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3ecb4693a0eea83cf7062ed9f948b1b015646f33c5d4103d88682da4bd5bad5' 
  AND token = '7UFxPXgUgnsKMUG4g8hNq3zHHUIku38h0MzAsDBPjwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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