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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2909c5e7f17bfcf9fffa380b57c6766ccad5c7c6564c954c1cbfb6d27c95412a' 
  AND token = 'xUtYKT3YZzxT12CpQv6k9iVHgLbBLXN8sLRGRQngjyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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